use just once per day for dawn-to-dark hold. it is important to use the product as directed. fixodent and forget it. and those people are what i like to call wrong. metamucil is the only leading fiber supplement with psyllium, which gels to help remove waste and reduce cholesterol. metamucil. ask more of your fiber. >> couric: finally tonight, we're down to the final week of summer and for birds that means the fall migration has begun. it's peak season for bird watching. this is no casual activity. in fact, mark vas man tells us it's one of the most popular competitions in america. (bird calling). >> reporter: for every backyard birder out there, this is nature's symphony. >> i had a hooded warbler. >> cool. >> reporter: greg mason is one of 48 million american birders, amateur audubons, they know a scarlet tan jeer from a rose-breasted grossby. or in this case... a green heron. >> reporter: that gets you jazzed, doesn't it? (laughter). >> it does! the thing is you start doing this and you go to kookytown. >> reporter: kookytown or just quirkytown, this is the annual great te